#smtp

Flask-Mail adds SMTP mail sending to your Flask applications

📮 A fully featured open source mail delivery platform for incoming & outgoing e-mail

Mail Analyzing Interface for email bounce: A Ruby library to parse RFC5322 bounce mails and generating structured data as JSON from parsed results. Ruby version of Sisimai: an error mail analyzer.

asyncio smtplib implementation

pytest plugin to test server connections locally. This repository was migrated from Bitbucket.

A resilient, configurable SMTP email sender

A high-level utility responsible for orchestrating the creation and delivery of templated email messages

Your API mocking tool for OpenAPI and AsyncAPI using Go and JavaScript - https://mokapi.io

A utility to place emails on Service Bus

A collection of helpful EmailMessage extension methods

A .NET thread-safe singleton HttpClient for Resend

An async thread-safe singleton for Resend OpenApiClient

An async thread-safe singleton for the SendGrid client

A .NET typesafe implementation of SendGrid's Contact API

Authenticated email gateway for AI agents — SPF/DKIM verified inbound, HMAC-signed delivery, webhook + WebSocket fan-out, CLI + SDKs

A powerful Model Context Protocol (MCP) server for IMAP email integration with Claude

Sisimai is a library provided as a Go package that decodes various formats of bounce emails and outputs structured data necessary for analysis, such as destination addresses and bounce reasons.

A Resend .NET client generated from their OpenAPI schema, updated daily

Cross-platform multi-protocol mock server — HTTP, WebSocket, gRPC, GraphQL, TCP, Redis, SMTP, MQTT — with a web UI, scenario system, and fault injection.

Upyo is a simple and cross-runtime library for sending email messages using SMTP and various email providers. It works on Node.js, Deno, Bun, and edge functions.

Agent-first CLI for Proton Mail. Schema manifest, NDJSON, typed errors, stable exit codes.